The Diocese of Rulenge-Ngara is situated in the North - Western corner of Tanzania within Kagera Region, covering an area of 13,004 km² out of 40,838 km² Kagera Region.The Diocese Borders with the countries of Rwanda in West, Burundi in South, to the east are the shores of Lake Victoria and Muleba District. The diocesan headquarters including the Bishop’s House are situated in Ngara, 45 km from Rulenge Pro-Cathedral.
The diocese covers a geographical area of three administrative districts of Ngara, Biharamulo and Chato. It is divided into three ecclesiastical deaneries of Ngara, Biharamulo, and Chato with a 300,000 catholic population and15 parishes. (Source: Rulenge-Ngara Diocesan Pastoral reports 2007).